Hugo jawtsch



H. JANscH.

MOTTLING TOOL. APPLICATION FILED Dsc. 1B. 191s.

. with precision and HUGO JANTSCI-I, 0F DETROIT, MICHIGAN,

Specification of Letters Patent.'

Application filed December 18, 1918. Serial No. 267,411.

To (LZZ whom 'it may concern:

Be it known that I, HUGO JAN'rsoH7 a former subject of the formerEmperor of Austria, and former resident of Bohemia, now residing atDetroit, county of lVayne,

State of Michigan, have invented a new and useful Improvement inMottlingTools, of which the following is a specification.

This invention relates to a machine for mottling or lapping metalsurfaces, especially for mottling steel surfaces, used in machineconstruction. This work has heretofore been done largely, if notentirely, by hand manipulation of a tool. It is the object of thepresent invention to provide a machine which is adapted to do this workwhat might he said almost automatically. The hand is used only to movethe tool across the work, While the operation and guiding of the tool isaccomplished by parts of the machine itself.

In the drawings,"

Figure l is a plan view of the tool. i

Fig. 2 is a cross section on the line 2-2 of Fig. l.

Fig. 8 is a fragmentarv side elevation of the tool taken at 'the left ofFig. 1.

Fig. 4 is a section on the line 41.--4 of Fig. Q.

Fig. 5 is an end elevation of the carriage.

In machine tool construction it is quite customary to give some of thesurface a wavy appearance, which is often called mottling. This has beenalmost universally accomplished heretofore bv manipulation of a handtool, that is to say, a tool was run across the surface by hand andgiven the necessary rocking or to and fro twisting motion to producethiseffect. Lapping of metal with emery spread on the surface and a coppertool has also been performed in this same way. It is the object of thisinvention to accomplish this mottling or lapping by eliminating thismanipulation.

a is a track comprising simply a bar with a cam in the form of scallopsb. This is connected with a bar c which performs much the same serviceas a bar of a T-square, namely, to engage one of theedges of the surfaceoperated upon to hold the track at a predetermined angle with respect tosuch edge. This angle may be varied at will by loosening and againtisrhtenino` the screw (Z. However, the angle ordinarilv used would bethat of about 45 degrees so as to cause the tool to operate on anoblique line across I the work. The track is undercut at each sideunderneath, as shown at c, e, to provide rabbets for the tongues 7 ofthe carriage g. The carriage is made up of a Z-bar 7L (Eig. 5). to whichis bolted a pair of blocks e' and y', the latter serving as a journalfor the rock shaft 7n. To one end of this is bolted the mottling orlapping tool m. Near the mid portion of this rock shaft an arm n isclamped on by the screw o. This arm has Patented Sept. 16, 1919..

on its under side a ball bearing p which runs over the scalloped race o.The spiral spring g bears against the top of the arm and tends to keepthe arm against the scalloped cam. This spring is housed in a smallhollow stud r screwed into the top of the Z-bar h and its pressure isadjustable with the nut s."

The carriage is moved forward over the track by the handle t, which ispivoted to the top of the Z-bar 7L. The handle will stop in the angular'relation shown in Fig. 1 when a pushing effort is exerted against thecarriage for it then encounters a stop in the form of the head of a boltu. When the handle is grasped to pull the carriage toward the operatorit moves the handle back into the line of draft, thereby causing the camfinger w to run in under the finger ai on the end of the arm a. Thisholds the ball 7i out of contact with the cam on the return stroke.

It will be evident that a pushing movement away from the operatoreXerted upon the carriage will cause the ball p to travel over thescalloped cam, thereby exerting a rocking' movement as well as a forwardmovement of the mottling or lapping tool m. This will cause a scrapingof the surface which will be relatively uniform due to the uniformity ofthe action controlled by the cam. The operation is a very easy and aquick one, the track serving not only as a guide to cause the tool totravel in a straight line but also serving to impart the rockingmovement when the tool is pushed over the guide. lhen the carriage ispulled back the ha udle automaticallv causes the cam follower to riseout of the scallops of the cam so that no rocking movement is impartedto the tool on the return.

What I claim is:

1. A machine for the purpose specified, comprising a track, a carriage,a tool mounted on the carriage to rock in `planes angularly related tothe line of travel of the carriage, and means for automatically rocknNVA ing the tool as the carriage is moved vover the track.

2. A machine for `the purpose specilied, having, in combination, a trackprovided with a cam surface, a carriage guided on thettra'ck, a-wtooljournaled to rock in said carriage in planes angularly related to theline of travel of the carriage, and means between the tooland the camfor giving the tool a rocking movement as the carriage is moved over thetrack.

3. A machine for the purpose specified, having. in combination, a trackprovided at one side with a scalloped cam, a carriage .designed to rideon the track, a tool mounted inthe carriage to rock in planes angularlyrelated to theline of travel of the tool asf it rides-with the carriage,and an arm secured' to the tool and adapted to ride over the scallopedcam to give the tool a rocking movement as the carriage is moved alongthe track.

4. A machine 4for the-purpose specilied, having in combination, a track,a cam hav- -inga scalloped surface, a carriage designed to travel onthetrack, a tool supported on the carriage to rock in planes angularlyrelated tofits line yof travel, an arm secured to the tool and having-aball bearing adapted toride on the scalloped cam, and a spring `it'orholding the 'arm kand the ball bearing against the cam.

f 5. A -machinelfor the .having in combination, a track, a cam survfacetherealong, a carriage adapted to ride on the track, a tool mounted onthe carriageI to rock inplanes angularly related to itsvline of travel,an` arm secured to the .purpose specilied,

VJtool and adapted to ride over the cam surface, anda movable handleadapted on the return movement oi the carriage to hold the farm out ofengagement with the cam.

6. A machine for the purpose specified, having in combination, a track,a cam surface therealong, a" carriage adapted to ride on said track, atool rockingl)7 supported in the carriage and provided with an arm having an extending finger, and a handle :secured pivotally to the carriageand provided with a cam finger which upon the movement f ing and guidinga tool that is reciprocated over a plane surface, a scalloped cam associated with said support, and a carriage bearing a scraping toolreciprocatable over said support, the said scalloped cam coincidentallycausing the tool to rock in planes angularly related to its line otVtravel in reciprocating the same along` the said support.

In witness whereof' l' have hereunto set -my hand on the 18th day o't'December,

HUGO JANTSCH.

"Copies bfthiapatentmaj be 4obtained for five cents each, by addressingthe Commissioner of Patents, Washington, D. C.

